A Zero-Voltage-Switching Contour-Based Power Amplifier With Minimal Efficiency Degradation Under Back-Off

作者：Singhal Nitesh^*; Nidhi Nitin; Patel Rishi; Pamarti Sudhakar

来源：IEEE Transactions on Microwave Theory and Techniques, 2011, 59(6): 1589-1598.

DOI：10.1109/TMTT.2011.2131677

• Peak-to-average power ratio (PAR)
• peak-to-minimum power ratio (PMR)
• power amplifier (PA)
• zero voltage switching (ZVS)

A switching power amplifier (PA) architecture that offers up to 13 dB of output power back-off without any drain efficiency degradation is presented. The proposed zero-voltage-switching (ZVS) contour-based PA employs a series class-E PA in conjunction with duty cycle modulation and a proposed tunable impedance transformation network. So-called ZVS conditions that ensure ideally 100% drain efficiency are satisfied not just at peak output power, but over the 13-dB back-off range. Theoretical analyses of losses in the PA and the impedance transformation network are also presented to prove that drain efficiency actually improves with back-off. Measurement results of a 100-MHz PA built using discrete components on an FR4 printed circuit board showing drain efficiency greater than or equal to the peak efficiency (40%) at all output power levels are also presented.

• 出版日期2011-6